D-Nuts by Die Free Co.

Published on May 12, 2025
Duration: 6:00

This guide details the installation of Die Free Co. D-Nuts, a clever adapter that allows M-LOK accessories to be mounted securely onto Q-C-R-T (also referred to as QERT) rail systems. The D-Nuts act as a stop-gap solution for users who want to leverage the widespread support of M-LOK accessories on rail systems that are not natively M-LOK compatible. The installation process involves replacing the standard M-LOK T-nut with the D-nut and then tightening the accessory, which draws the D-nut into place, creating a robust and secure attachment.

Quick Summary

Die Free Co. D-Nuts are adapters that allow M-LOK accessories to be mounted on Q-C-R-T (Q-C-R-T) rail systems. They replace standard T-nuts and, when tightened, wedge under the rail lip for a secure attachment, bridging compatibility gaps for firearm accessories.

Chapters

  1. 00:06Introduction to D-Nuts
  2. 00:26Why D-Nuts are Needed
  3. 00:57D-Nut Components and Design
  4. 01:41How to Install D-Nuts
  5. 03:21Example Installation: Hand Stop
  6. 03:35Example Installation: Light Mount
  7. 04:48Final Thoughts on D-Nuts
  8. 05:11Where to Buy D-Nuts

Frequently Asked Questions

What are Die Free Co. D-Nuts used for?

Die Free Co. D-Nuts are used as adapters to mount M-LOK accessories onto Q-C-R-T (Q-C-R-T) rail systems. They provide a solution for users who want to utilize the wide range of M-LOK accessories on firearms that do not natively support M-LOK.

How do D-Nuts attach M-LOK accessories to Q-C-R-T rails?

D-Nuts replace the standard M-LOK T-nut. When the accessory is tightened, the D-nut is drawn into the accessory and wedges under the lip of the Q-C-R-T rail, creating a secure and stable attachment.

What is the installation process for D-Nuts?

First, remove the original T-nut from your M-LOK accessory. Thread the D-nut onto the accessory's screw, ensuring the open section faces the accessory. Position the accessory in the Q-C-R-T slot and tighten the screw to secure the D-nut.

Can I use any M-LOK accessory with D-Nuts on a Q-C-R-T rail?

Yes, D-Nuts are designed to work with most M-LOK accessories that would typically occupy one M-LOK slot. The key is that the accessory has a compatible bottom profile for the D-nut to engage with.

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